I wanted to add a postscript to say that the idea of Electors campaigning is not so far fetched.
In California, during the 2003 recall election of Governor Gray Davis, there was a two-part ballot: part one was yes/no to recall Davis, and part two was whom to vote for as his replacement. There were no primaries, only announced candidates.
There were 135 candidates on the recall ballot, so having a ballot with many candidates for the Electoral College is not impossible.
I will add this, though, for humor's sake: while Arnold Schwarzenegger won the recall with 48.58% of the ballot, a man named George B. Schwartzman came in 9th place, possibly because his name appeared right above Schwarzenegger's on the ballot.
-PJ
Despite idiots and moralists, the question is what our Founders meant.